2 Chronicles 30:17
For there were still a number of the people there who had not made themselves holy: so the Levites had to put Passover lambs to death for those who were not clean, to make them holy to the Lord.
2 Chronicles 29:34
There were not enough priests for the work of cutting up all the burned offerings; so their brothers the Levites gave them help till the work was done and the priests had made themselves holy: for the Levites were more upright in heart to make themselves holy than the priests.
Exodus 12:6
Keep it till the fourteenth day of the same month, when everyone who is of the children of Israel is to put it to death between sundown and dark.
2 Chronicles 35:3-6
And he said to the Levites, the teachers of all Israel, who were holy to the Lord, See, the holy ark is in the house which Solomon, the son of David, king of Israel, made; it will no longer have to be transported on your backs: now be the servants of the Lord your God and his people Israel,